TPS92640_15 Datasheet, PDF (1/37 Pages) Texas Instruments – Synchronous Buck Controllers for Precision Dimming LED Drivers

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TPS92640, TPS92641
SNVS902A – OCTOBER 2012 – REVISED OCTOBER 2015
TPS9264x Synchronous Buck Controllers for Precision Dimming LED Drivers
1 Features
•1 V_IN Range from 7 V to 85 V
• Wide Dimming Range
– 500:1 Analog Dimming
– 2500:1 Standard PWM Dimming
– 20000:1 Shunt FET PWM Dimming
• Adjustable LED Current Sense Voltage
• 2-Ω, 1-A_peak MOSFET Gate Drivers
• Shunt Dimming MOSFET Gate Driver (TPS92641)
• Programmable Switching Frequency
• Precision Voltage Reference 3 V ±2%
• Input UVLO and Output OVP
• Low Power Shutdown Mode and Thermal
Shutdown
2 Applications
• LED Driver / Constant Current Regulator
• Architectural LED Lighting Drivers
• Automotive LED Drivers
• General LED Illumination
3 Description
The TPS92640 and TPS92641 devices are high-
voltage, synchronous NFET controllers for buck-
current regulators. Output current regulation is based
on valley current-mode operation using a controlled
on-time architecture. This control method eases the
design of loop compensation while maintaining nearly
constant switching frequency. The TPS92640 and
TPS92641 devices include a high-voltage start-up
regulator that operates over a wide input range of 7 V
to 85 V. The PWM controller is designed for high
speed capability, including an oscillator frequency
range up to 1 MHz. The deadtime between high side
and low side gate driver is optimized to provide very
high efficiency over a wide input operating voltage
and output power range. The TPS92640 and
TPS92641 devices accept both analog and PWM
input signals, resulting in exceptional dimming control
range. Linear response characteristics between input
command and LED current is achieved with true zero
LED current using low off-set error amplifier and
proprietary PWM dimming logic. Both devices also
include precision reference capable of supplying
current to low power microcontroller. Protection
features include cycle-by-cycle current protection,
overvoltage protection, and thermal shutdown. The
TPS92641 device includes a shunt FET dimming
input and MOSFET driver for high resolution PWM
dimming.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS92640
HTSSOP (14)
4.40 mm × 5.00 mm
TPS92641
HTSSOP (16)
4.40 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN
CIN1
CIN2
RON
RUDIM1
CON
PWM
RUDIM2
RUDIM3
RVOUT2
CVREF
RIADJ1
RIADJ2
CCOMP
*SDIM
*TPS92641 ONLY
Typical Application Diagram
TPS92640/641
VIN
HG
RON
SW
UDIM
BOOT
VOUT
VCC
VREF
LG
IADJ
CS
COMP
DAP
GND
SDIM
SDRV
RHG
QHS
CBOOT
DBOOT
RLG
RF
CVCC
L
QLS
COUT
*QSDIM
RCS
RVOUT1
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.